Data Transmission Method, Base Station, And Wireless Communications Device

1. A data transmission method in un-acknowledgement mode (UM), comprising: receiving, by a primary base station, offloading information from a secondary base station; adjusting, by the primary base station according to the offloading information, amount of data that is allocated to the secondary base station; wherein the offloading information comprises a sequence number of a last Packet Data Convergence Protocol (PDCP) packet data unit (PDU) from the secondary base station to a terminal, and a value of the sequence number comprises an integer; and wherein the adjusting the amount of data comprises: determining, by the primary base station according to the offloading information, that a difference between a sequence number of a first PDU that is waiting to be reordered in a reordering window and an upper boundary of the reordering window is greater than a preset value; and adjusting, by the primary base station, the amount of data that is allocated to the secondary base station, wherein the difference between the sequence number of the first PDU that is waiting to be reordered and the upper boundary of the reordering window is not greater than the preset value.

2. The method according to claim 1 , further comprising: requesting the secondary base station to report the sequence number of the last PDCP PDU sent to the terminal.

3. The method according to claim 1 , further comprising: requesting the secondary base station to report, according to a report period, the sequence number of the last PDCP PDU sent to the terminal.

4. The method according to claim 1 , wherein the upper boundary of the reordering window is equal to a value of a largest sequence number of a PDU received by the terminal plus one, and the preset value is a value that is less than or equal to a size of the reordering window.

5. A primary base station, comprising: a receiver configured to receive offloading information from a secondary base station; a non-transitory memory storage comprising instructions; and one or more hardware processors in communication with the non-transitory memory storage, wherein the one or more hardware processors execute the instructions to: adjust, according to the offloading information, amount of data that is allocated to the secondary base station in un-acknowledgement mode; wherein the offloading information comprises a sequence number of a last Packet Data Convergence Protocol (PDCP) packet data unit (PDU) from the secondary base station to a terminal, and a value of the sequence number comprises an integer; and wherein the one or more hardware processors execute the instructions to adjust the amount of data comprises the one or more hardware processors execute the instructions to: determine, according to the offloading information, that a difference between a sequence number of a first PDU that is waiting to be reordered in a reordering window and an upper boundary of the reordering window is greater than a preset value; and adjust the amount of data that is allocated to the secondary base station, wherein the difference between the sequence number of the first PDU that is waiting to be reordered and the upper boundary of the reordering window is not greater than the preset value.

6. The primary base station according to claim 5 , further comprising: a transmitter configured to request the secondary base station to report the sequence number of the last PDCP PDU sent to the terminal.

7. The primary base station according to claim 5 , further comprising: a transmitter configured to request the secondary base station to report, according to a report period, the sequence number of the last PDCP PDU sent to the terminal.

8. The primary base station according to claim 5 , wherein the upper boundary of the reordering window is equal to a value of a largest sequence number of a PDU received by the terminal plus one, and the preset value is a value that is less than or equal to a size of the reordering window.

9. A data transmission method in un-acknowledgement mode, comprising: sending, by a secondary base station, offloading information to a primary base station; performing data transmission with a terminal according to amount of data that is allocated to the secondary base station and that is adjusted by the primary base station, wherein the primary base station adjusts the amount of data by: determining, according to the offloading information, that a difference between a sequence number of a first PDU that is waiting to be reordered in a reordering window and an upper boundary of the reordering window is greater than a preset value; and adjusting the amount of data that is allocated to the secondary base station, wherein the difference between the sequence number of the first PDU that is waiting to be reordered and the upper boundary of the reordering window is not greater than the preset value; and wherein the offloading information comprises a sequence number of a last Packet Data Convergence Protocol (PDCP) packet data unit (PDU) from the secondary base station to the terminal, and a value of the sequence number comprises an integer.

10. The method according to claim 9 , further comprises: receiving, from the primary base station, a request to report the sequence number of the last PDCP PDU sent to the terminal; or receiving, from the primary base station, a request to report, according to a report period, the sequence number of the last PDCP PDU sent to the terminal.

11. A secondary base station, comprising: a processor; memory coupled to the processor, the memory comprising instructions that, when executed by the processor, cause the secondary base station to: send offloading information to a primary base station; perform data transmission with a terminal according to amount of data that is allocated to the secondary base station and that is adjusted by the primary base station, wherein the primary base station adjusts the amount of data by: determining, according to the offloading information, that a difference between a sequence number of a first PDU that is waiting to be reordered in a reordering window and an upper boundary of the reordering window is greater than a preset value; and adjusting the amount of data that is allocated to the secondary base station, wherein the difference between the sequence number of the first PDU that is waiting to be reordered and the upper boundary of the reordering window is not greater than the preset value; and wherein the offloading information comprises a sequence number of a last packet data unit (PDU) sent by the secondary base station to the terminal, and a value of the sequence number comprises an integer.

12. The secondary base station according to claim 11 , further comprising instructions that, when executed by the processor, cause the secondary base station to: report the sequence number of the last PDU sent to the terminal; or report, according to a report period, the sequence number of the last PDU sent to the terminal.